How to make a chrome texture in eevee?
Making good looking materials is dependent on a number of things like

Shape: Chrome is usually applied to an organic looking metal object like a fender. 

Environment: A nice environment that make reflections in the surface. Make sure to use a reflection probe in EEVEE. 

Material

Color: Chrome R=0.550,G=0.556,B=0.554 (https://docs.unrealengine.com/en-us/Engine/Rendering/Materials/PhysicallyBased) 

Metallic: A metal material is always 1.0 in metallic.

Roughness: It's usually a matter of taste but since it is Chrome it should be fairly shiny. Is really good to have a noise texture here so you will get variation and imperfections.